Refrigeration motor and pump



Nov. 1, 1932. A. B. BAILEY 1,835,793

REFRIGERATION MOTOR AND PUMP Filed June 25. 1927 [n l/enbor; 37/770/0 B.Ba/'/ fltborney.

Patented Nov. 1, 1932 UNITED ,STATES mans PATENT OFFICE ARNOLD B. BAILEY, OF.LYNN, MASSACHUSETTS REFRIGERATION MOTOR AND PUMP Application filed June 25, 1927. Serial No. 201,417. I i

. The invention relates to pumps especially adapted to refrigerating devicess uch as storage boxes usedin the home. The invention consists of a receptacle having a flexible rereciprocating pump therein which is operated by the expansion of volatile fluid. The expansion of the fluid imparts a forcing movement to the refrigerating fluid in the pump or the fluid which is led through a pipe to a g fluids used. A further object of the inven-.

tion is to provide an efficient cooling motor with the least number of parts which is eflicient and cheap to manufacture. Referring to the drawin Y Fi ure 1 is a side elevatlon vof the storage box or which the improved cooling apparatus is adapted, and is shown in position under the box, but it can be placed in any suitable position.

Figure 2 is a diagrammatic view of the improved refrigerating apparatus connected to a cooling system.

Figure 3 is a modifiedconstruction of the motor having a disc diaphragm instead of a diaphragm bellows.

Referring to the drawing 10 represents a casing of the improved flexible pump having a suitable cover 11. The pump is best adapted for. refrigerating purposes as illustrated in Figure 1 showing a device supported on the storage box 12 for convenience. The storage box 12 is kept automatically cooled in the fluid pipin system connected to the outlet pipe 13 an the inlet pipe 14 to preserve t e food, in the said storage box. Secured to theunder side of the cover 11 inside the casing 10 is apumping bellows 15 which expands and contracts for the purpose of creating a-pumping action for forcing the cooling fluid through the piping system. The opposite end of the diaphragm bellows 15 is provided with a cover 16 having an extended edge which is adapted to receive the coil spring 18. The opposite end of the coil spring 18 rests against the stationary cover 11 and constantly forces the bellows 15 downwardly by the pressure against the ledge 17. Although the spring 18 is' not absolutely necessary because the functioning of the bell'ows is to be raised and lowered by expansion and contraction of the fluid, but to insure a quick expansion of the bellows 15 the spring 18 is provided.

Inclosed in the casing 10 is a volatile ex- .pansion fluid 19 which under heat application expands, which acts against the diaphragm bellows 15 to move it upwardly against the pressure of the spring 18. When the fluid 19 cools down which lessens its expansive function the bellows 15 moves downwardly in the opposite direction. As the bellows 15 moves up and down by expansion and I contraction it imparts a reci rocating pumping action which forces t e refrigerating fluid 20 into the pipe 13 and thenceto the condenser coil 21. The pressure in the coil 21 is built up against the expansion valve 23 which liquefies the fluid as it is led through the pipe 24. The fluid 20 as it passes out of the expansion valve 22 through the pipe 24 into the coil 25 is transformed into a gas which absorbs the heat from the surrounding area and cools it down to a preserving temperature in such an inclosure as indicated by the storage box 12. The gas from the cooling coil 25 passes into the pipe 14 and thence into the bellows15 which com-' pletes the cycle of operation. The fluid 20 when forced into the pipe 13 is prevented fromreturning by a check valve 26 while the returning gases in the pipe 14 are held in backward check by the valve 27 and revents it from returning to the cooling coi 25.

In devices of this kind it is necessary to regulate the fluid and the mechanism automatically'to render the cooling function constant and to accomplish this a special device is-provided consisting of a heating coil 28 Wh-lCh receives its electrical current through 1' the wire circuit 29. The electrical current is controlled by a hand switch 30. The heating coil 28 is surrounded by the volatile fluid 19 which will-expand readily under heat application so as to operate against the bellows 15. Connected into the electrical circuit is an automatically operated mercury switch 31 secured to the swinging table 32, one end .of

which is pivotally secured to the supporting member 33. The mercury switch consists of a glass or quartz bulb in which there is a mercury fluid the level of which is clllian ed by the movement of the table and t e downward or upward swing which disconnects the leads 34 and 35 to make and break the electrical current for energizing or deenergizing the heating coil and serves as a regulating device for controlling the refrigerzo ating system.

Secured tothe cover 16 and subjected to the movements of the bellows 15 are the operating arms 36 and 37 which cooperate with the mercury switch 35 for controllin the 25 regulating mechanism; When the v0 atile fluid in the casing 10 is heated by the electrical coil 28 it expands to such an extent that it forces the bellows 15 upwardly against the pressure of the spring 18. When the so bellows 15 is forced upwardly by the ex ansion of the volatile fluid it forces the re rigerating fluid 20 in the bellows 15 into the pipe 13, coil 21 where it is condensed into a liquid,

after which it passes into the pipe 22 through the expansion valve 23 through the pipe 24 to the cooling coil 25 which keeps the storage box cool. The vapor fluid in the cooling pipe 25 passes into the pipe 14 to the pumping bellows 15 where it is used over and over again. Nominally the' mercury switch is closed and controlled by a hand switch 30.

When the current is turned on it heats the coil 28.. The heat is imparted to and expands the volatile liquid in the box 10 which acts directly as a pressure against the pum mg bellows 15 and forces it upwardly. e

u ward movement of the bellows 15 carries with it the switch operating arms 36 and 37 which lifts the table 32, mercury switch bulb 31 with it in its upward path.

When a predetermined temperature is reached or when the cooling fluid temperature is lowered'the bellows 15, operating arms 36 and 37 drop downwardly carrying with them the switch lever with the switch contacts thereon for controlling the heating current. This downward movement, and also the upward movement renders a constant tempera ture in the cooling box 12 and as the pump 15 expands and contracts the pumping action takes place as the temperature changes which causes automatic regulation to take place.

A modified construction can be used as shown in Figure 3 which shows a diaphragm disk 38 instead of a bellows 15. The action ulb. This movement consists of a and function of this device is identical with the main construction and automatic regulation as shown. 7

In accordance with the provision of the patent statutes, I have described'the principle of operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrated and that the invention may be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States is:

1. In a pumping apparatus for a refrigerating machine, thecombination of a casing, a flexible pump in the casing, an expansible fluid surrounding the pump in the casing, an 1 electrical heating coil in the expansible fluid for operating the pump in one direction, corrugated wal s in the pump and a spring for operating the said pump in the opposite direction, and means for controlling the heating coil. y

2. In a pumping apparatus for a refrigerating machine, the combination of a casing, a flexible pump in the casing, an expansible fluid surrounding the pump in the casing, an electrical heating coil in the expansible fluid for operating the pump in one direction, corrugated walls in the pump and a spring for'operating the .said pump in the opposite direction, electrical contacts connected to the movable pump, a swinging mercury switch cooperating with the contacts for controlling the electrical current for regulating the machine.

3. In a pumping apparatus for a refrigerating machine, the combination of a casing,

a flexible pump in the casing, a'cover for the casing, an expansible fluid surrounding the pump in the casing, a heating and regulatpipes in the cover for leading the fluid to the refrigerator.

ARNOLD B. BAILEY. 

